Hydraulic-dredger cutter.



P atented lulyza, 1902;

R'. A-..PERRY. HYDRAULIC DBEDGER CUTTER.

(Application filed Km. 10, 1902.)

THE NQRRIS PETERS co. worcurnow WASHINGTON, n. c.

UNITED I STATES PATENT Oriucs.

RAYMOND A. PERRY, OF OAKLAND, CALIFORNIA, ASSIGNOR OF ONE-HALF TO ATLANTIC GULF dt PACIFIC (30., OF NEW YORK, N. Y., AND SAN FRANCISCO, CALIFORNIA, A CORPORATION OF WEST VIRGINIA.

HYDR AULlC-DREDG ER CUTTER.

fiPEOIFICATION forming part of Letters Patent No. 705,784, dated July 29, 1902. Applicationiiled March 10, 1902 fierlal No. 97 457. (No model.)

To aZZ whom it may concern: ment I am enabled to excavate and break up Be it known that I, RAYMOND A. PERRY, a any kind of material in which the dredge is citizen of the UnitedStates, residing in Oakcalled upon to work and prepare it for the land, county of Alameda, State of California, suction-pipe, the mouth of which is located 5 have invented an Improvement in Hydrauliccontiguous to or within the circle of revolu- 5 5 Dredger Gutters; and I hereby declare the tion of the cutters. following to be a full, clear, and exact de- In the construction of my cutter I have I scription of the same. found a very suitable method is to make a My invention relates to cutters which are suitable casting forming a hub A, with a plu- IO especially designed for use upon hydraulicrality of radial arms 2 extending outwardly 6o dredging apparatus; and it consists of radial and having upon the outer ends the flat exarms firmly attached to the revolublelactuattended surfaces or plates 3, which are also ing-shaft and having cutting teeth or blades cast with the central portion. The hub has at the outer ends of the arms, so as to loosen made through it a hole adapted to fit the and break up the material which is then conshaft. This hole may be circular to fit a cy- 65 ditioned to be removed by the suction-pipe lindrical shaft and have a sufficient key or of the apparatus to which it is especially keys to secure it thereto. I have here shown adapted. it as made rectangular, as at 4, and adapted My invention also comprises details of conto fit upon a correspondingly-shaped end of co struction which willbe more fully explained the revoluble shaft 5, through which power 7d by reference to the accompanying drawings, is transmitted to drive it. Upon the ends 3 in whicha of the arms are the cutting-blades 6, which Figure l is an end view of myimproved hyare made of steel or other suitable material draulic-dredger cutter. Fig. 2 is a side view and may be secured by countersunk rivets of same. Fig. 3 is an enlarged detail view of passing through the blades and the ends of 75 same. the arms to which they are secured, or they In the employment of hydraulic suctionmay be cast or forged directly upon the dredges, to which class my invention is espearms. The blades may be set either paralcially applicable, revoluble cutters have been lel with the shaft, or, as shown in Fig. 2, at

constructed having bottomless buckets with an angle therewith, and the outer ends of 80 circumferential surrounding rings and tied the bladesmay be beveled, so that when the together with longitudinal bars, these bars blades are not parallel with the shaft the either being at right angles or some other anfront ends of these cutters will be approxigle from the circumferential rings. These mately parallel with the surface of the bank rings and bars form a framework to which which is being excavated. The suction pipe 85 the buckets are attached, and this frame- 8 generally extends below the shaft and may work is in turn secured to the shaft. The extend into the space inclosed by the revolv:

reat disadvantage of this class of excavators ing cutters, so that material which isexca- 1s that in sticky material the buckets and the vated and broken up by the cutters may. be

framework ofier such an obstruction to the drawn into the pipe in conjunction with a 90 passage of material that the cutter is often body of water sufficient to cause the material plugged up and the operation hasto be susto flow freely through the pipes and be eventpended for the purpose of cleaning, which ually discharged as in the manner of this causes great delay and expense. It is the obclass of dredges.

ject of my invention to provide a cutter of While I have shown the radial arms and 5' such a character that this clogging of adherhub made as of a single casting of steel, it out material is avoided, and by doing away will be understood that the arms might be with all surrounding rings, bars, or support separately bolted upon a hub or flange keyed ing-framework and having the cutters at the or otherwise secured to the shaft and the ends of radial arms without other attachcutter-blades formed wither secured to the IOO factory for work in heavy or sticky and adhesive clay, also in hard-pan and other material where it has been found impossible to excavate it with the buckets ordinarily used.

Having thus described my invention, What I'claim, and desire to secure by Letters Patent, is-

1. The combination of a revoluble shaft, a hub and means for securing it to the shaft,

arms extending radially outward from the hub and having their outer ends flattened to form a transversely -extended bearing surface, cutters fitted flatwise against said surface, and a suction-pipe having its mouth located contiguous to the cutter.

2. The combination of a revoluble shaft, a hub and means for securing it to the shaft, arms extending radially outward from the hub, flat plates secured to the outer ends of the arms and extending transversely beyond the arms, cutters fitted fiatwise against the flat plates, and a suction pipe, having its mouth located within the circle of revolution and contiguous to the cutter.

In Witness whereof I have hereunto set my hand.

RAYMOND A. PERRY. Witnesses:-

S. H; NOURSE, J ESSIE C. BRODIE. 

